The main purpose of this study is to measure the effect, safety and how well the body absorbs lebrikizumab in pediatric participants 6 months to <18 years of age with moderate-to-severe atopic dermatitis (AD).

Inclusion Criteria:

• Have a diagnosis of AD prior to screening as stated in the criteria by the American Academy of Dermatology for at least,

  • 12 months if participants are ≥6 years of age
  • 6 months if participants are 2 to <6 years of age
  • 3 months if participants are 6 months to <2 years of age.

• Have an EASI score ≥16 at the screening and baseline

• Have an IGA score ≥3 (scale of 0 to 4) at the screening and baseline

• Have ≥10% BSA of AD involvement at the screening and baseline.

Exclusion Criteria:

• Are currently enrolled or have participated within the last 8 weeks in a clinical study involving an investigational intervention or any other type of medical research judged not to be scientifically or medically compatible with this study.
• Treatment with the following prior to the baseline:
• An investigational drug within 8 weeks or less than 5 half-lives, whichever is longer.
• Dupilumab within 8 weeks. Note: The enrollment of participants with prior use of Dupilumab will be limited to <20%.
• Treatment with a topical investigational drug within 2 weeks prior to the baseline.
• Have received a Bacillus Calmette-Guerin vaccination or treatment within less than 4 weeks before randomization.

Anonymized individual patient level data will be provided in a secure access environment upon approval of a research proposal and a signed data sharing agreement.

Data are available 6 months after the primary publication and approval of the indication studied in the US and European Union (EU), whichever is later. Data will be indefinitely available for requesting.

A research proposal must be approved by an independent review panel and researchers must sign a data sharing agreement.